He was wrongly accusing his father of being responsible for the death of his older brother , who died from a drugs overdose in 2016.

Boxall, whose mental health problems began when he started smoking cannabis aged 14, had been discharged from mental health services previously, but had a “relapse” after smoking cannabis again, Hull Crown Court heard.

He had a chemical imbalance in the brain as a result of cannabis use, prosecutor Ian Brook said.

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Now, Hull’s most senior judge, Judge Jeremy Richardson QC, Recorder of Hull and East Riding, has issued a warning over the dangers of cannabis.

Sentencing Boxall on Tuesday, Judge Richardson said: “I make this observation: cannabis is often thought to have little or no harmful consequences if consumed in what is described, indeed mis-described, as being for recreational purposes.

The scene in Southcoates Avenue (Image: Jerome Ellerby)

“That may be the case, sometimes. This case, in common with several other cases, reveals that cannabis is a mind-altering drug which can, in certain circumstances, have consequences of a very disadvantageous character.

“Cannabis is a dangerous drug; that is why it is included in the Dangerous Drugs Act. The defendant in this case did as he did due to a drug-induced psychosis. He was, and remains, mentally ill, and that is why he intended to harm his father very seriously.”

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Mr Brook said when he was younger Boxall’s parents were concerned about the company he was keeping, so allowed him to smoke cannabis at home. He eventually stopped going out, then appeared to have a crisis aged 21 when he was detained under the Mental Health Act after setting fire to his clothes.

He later changed his religion to Hinduism and used to go on long bicycle rides, but once came home without the bike, saying he “no longer needed such a material possession”. He also took up poetry and began writing about a woman he met at a gym.

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Boxall was “grumpy” when he came home on the night of the attack, which happened when his mother had gone downstairs to let the dog in. She heard “a commotion upstairs, like fighting”, rushed up and saw her son attacking his father with a monkey wrench.

As she tried to seize the weapon, Boxall said: “He’s got to die, he killed Ryan.”

Jordan's brother, Ryan

Boxall also began using a knife, while his father was also being attacked by the dog, which went “beserk”.

Boxall was eventually ejected from the house and was detained by armed police, who found a second knife he had used in a neighbour’s garden. His father, who did not want him prosecuted, suffered a series of injuries to his head, face and body and needed a skin graft.